Evidence of direct methane production from long-chain fatty acids by thermophilic Archaeoglobi.

Candidatus Methanoglobus sphaerolipidus DLY3, an archaeon from Archaeoglobi, directly produces methane from long-chain fatty acids, expanding known methanogenic pathways.

• Why it matters: Understanding methane production is crucial for insights into global carbon cycling and greenhouse gas emissions, especially since traditional models involve microbial partnerships rather than direct conversion by archaea.
• What they did: Researchers enriched and characterized Ca. M. sphaerolipidus from hot spring sediments using growth experiments, microscopy, isotope tracing, metagenomics, and transcriptomics, revealing its ability to convert long-chain fatty acids directly to methane via liparotrophy.
• The result: This discovery broadens the substrate range of methanogenic archaea, indicating they can independently degrade complex fatty acids, which has implications for biogeochemical models and methane mitigation strategies.